thread-id.cc

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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "src/execution/thread-id.h"
#include "src/base/lazy-instance.h"
#include "src/base/platform/platform.h"
 
namespace v8 {
namespace internal {
 
namespace {
 
thread_local int thread_id = 0;
 
std::atomic<int> next_thread_id{1};
 
}  // namespace
 
// static
ThreadId ThreadId::TryGetCurrent() {
  return thread_id == 0 ? Invalid() : ThreadId(thread_id);
}
 
// static
int ThreadId::GetCurrentThreadId() {
  if (thread_id == 0) {
    thread_id = next_thread_id.fetch_add(1);
    CHECK_LE(1, thread_id);
  }
  return thread_id;
}
 
}  // namespace internal
}  // namespace v8